Upgrade django-pyfs to 1.0.6

- PLAT-1594 upgrade to official Django 1.11 support version

requirements/edx/base.txt

@@ -28,6 +28,7 @@ django-mptt==0.7.4
 django-oauth-plus==2.2.8
 django-oauth-toolkit==0.10.0
 django-pipeline-forgiving==1.0.0
+django-pyfs==1.0.6
 django-sekizai==0.8.2
 django-ses==0.7.1
 django-simple-history==1.6.3

requirements/edx/github.txt

@@ -54,7 +54,6 @@ git+https://github.com/edx/nltk.git@2.0.6#egg=nltk==2.0.6
 -e git+https://github.com/dementrock/pystache_custom.git@776973740bdaad83a3b029f96e415a7d1e8bec2f#egg=pystache_custom-dev
 -e git+https://github.com/appliedsec/pygeoip.git@95e69341cebf5a6a9fbf7c4f5439d458898bdc3b#egg=pygeoip
 -e git+https://github.com/jazkarta/edx-jsme.git@690dbf75441fa91c7c4899df0b83d77f7deb5458#egg=edx-jsme
-git+https://github.com/edx/django-pyfs.git@1.0.3#egg=django-pyfs==1.0.3
 git+https://github.com/mitodl/django-cas.git@v2.1.1#egg=django-cas==2.1.1
 -e git+https://github.com/dgrtwo/ParsePy.git@7949b9f754d1445eff8e8f20d0e967b9a6420639#egg=parse_rest
 # Master pyfs has a bug working with VPC auth. This is a fix. We should switch